This takes you to a page where you can download a viewer and a few demo
files.

How Licensing RDM Integrity Works

The RDM-I program is licensed software. It is not freeware. However,
the PC program may be downloaded and used in a viewer mode for free.
Licensing is done by registering a unique identifier for the
controller to our online server . When the program see a
controller that it has not seen before it checks with the RDM Integrity
server over the internet. It checks whether the connected controller is
registered with the server. If it is, the registration is stored in the
user's PC. Any future connection will not require checking the
registration on the server. For computers that are never
connected to the internet, a registration key can be gotten from
Goddard Design. Initial registration with the online RDM Integrity
server may take as long as 3 business days. Subsequent registration
takes about 15 seconds.